6327-87-3

The ability of HL1 (1,3-dipyridin-3-yl-propane-1,3-dione) and HL2 (1-pyridin-4-yl-3pyridin-3-yl-propane-1,3-dione) to form coordination polymers and metal-organic gels with Mn(ii)/Cd(ii)/Zn(ii)/Ag(i) was explored. The reactions of HL1 with acetate salts of Mn(ii), Cd(ii) and Zn(ii) were found to yield coordination polymers 1-3, respectively, with a common formula of [M(L1)2]n. The crystal structure analyses revealed that complexes 1 and 2 are isostructural with a 2D corrugated layer in which M(L1)2 building blocks are interconnected to form M4(L1)4 macrocycles with square geometries. Although the complex 3 contains a similar layer as the above two, it differs significantly due to the differences in the geometry of L1. The 2D-layers interdigitate through aromatic interactions in 1 and 2, whereas the extent of such interdigitation is less in 3. The unsymmetrical HL2 was also found to form coordination polymer [Mn(L2)2]n, 4, upon treatment with Mn(OAc)2. The complex 4 exhibits a similar 2D-network as in 3 due to the fact that only 3-pyridyl is involved in coordination leaving 4-pyridyl uncoordinated. Further, the reaction of complex 1 with AgNO3 in DMSO was found to form a hetero-metal-organic gel (HMOG) while the reaction of HL1 with CdBr2 resulted in the formation of a metal-organic gel (MOG). The gel materials were characterized by various microscopic and rheological studies. Further, the presence of both Mn(ii) and Ag(i) in HMOG was confirmed by EDAX experiments. Both the gels were found to exhibit thixotropic behaviour, and the firmness of MOG was found to be much higher than that of HMOG. The reaction of Ag(i) salt with HL1 resulted in single crystals of the complex [Ag(HL1)(O3SCF3)]n, 5, which gave significant insights into the structures of gels. The luminescence studies indicate that complexes 2, 3 and MOG exhibit better luminescence compared to 1 and HMOG. Similarly, the MOG was found to be a better dye absorbing material than HMOG.

The invention provides an aqueous fluorescent nail polish. The aqueous fluorescent nail polish comprises: 20 wt% to 50 wt% of an ethanol solution of fluorescent dye and 50 wt% to 80 wt% of an aqueouspolyurethane, wherein the fluorescent dye is selected from one or more of structures of formulae (I) to (IV). The specific structures of formulae (I) to (IV) are selected as the fluorescent dye, and the fluorescent dye is not absorbed in visible light region, so that the nail polish is colorless, transparent and completely invisible under common sunlight condition, and the nail polish displays bright fluorescence only when being irradiated by ultraviolet rays, so that contrast is improved. Compared with conventional oily dye, the fluorescent ink system of the nail polish uses water as a dissolving carrier and has advantages of no toxicity, no generation of volatile organic gas, no pollution, reduced resource consumption, reduced environmental protection cost, no risk of burning or explosion and improved safety. In addition, fluorescent colors of the nail polish include blue, green, yellow, red and the like, and the colors can be arbitrarily combined into different colors.

The invention provides water-based invisible red fluorescent anti-counterfeiting ink and a preparation method and application method thereof. Fluorescent molecules in a dye aqueous solution which is adopted by the water-based invisible red fluorescent anti-counterfeiting ink have no absorption in the visible light region, and therefore the ink is colorless, transparent and completely invisible under the conditions of ordinary sunlight, and shows bright fluorescence only under ultraviolet irradiation, so that the contrast and anti-counterfeiting security are improved. Meanwhile, water is adopted as a dissolving carrier for the water-based invisible fluorescent anti-counterfeiting ink system, the ink is safe, non-toxic, and has no generation of volatile organic gas, and no pollution comparedwith conventional oil-based dye, resource consumption is reduced, the environment-friendly cost is reduced, no explosion risks are produced, and the safety of the operating environment is improved; and in addition, through the fluorescent color of the water-based invisible fluorescent anti-counterfeiting ink, the problem of singular color of current fluorescent anti-counterfeiting dye is solved.

β-Ketocarboxylic acids including β-ketoglutaric acid half-esters were cyclized by treating them with 1,1'-carbonyl-diimidazole to give 6-substituted 3-acyl-4-hydroxy-2-pyrones in good yields. 5-Aryl-3,5-dioxo-1-pentanoic acid and monomethyl malonate gave 6-aryl-4-hydroxy-2-pyrone and dimethyl β-ketoglutarate, respectively, on similar treatment.Anibin, one of the Aniba alkaloids, was synthesized from 5-(3-pyridyl)-4-hydroxy-2-pyrone.In addition, it was confirmed that reaction of magnesium β-ketocarboxylate with acylimidazolide gave the corresponding acyclic β-diketone in excellent yield.Keywords - β-ketocarboxilic acid; biogenetic-type synthesis; 4-hydroxy-2-pyrone; β-polyketide; β-ketoglutaric acid; dehydroacetic acid; anibin; Aniba alkaloid; 3-acyl-4-hydroxy-2-pyrone; β-diketone.

Reduction of diketones I with zinc and formic acid gives monoketones II.Diketones Ia, IIIb, IIIc are converted with hydrazines to pyrazoles VIa, IVa, IVb, V.Methiodides VII are reduced with sodium borohydride to derivatives of 1-methyl-3-piperideine VIII-